animation cancel function?

By default, when you are in casting a skill, if you doing other action (cast other skill or dodge roll) the current skill is cancel.
I want to turn off this function, because it makes my gameplay so inconvenient

I use WASD, right mouse is main attack. my play need to active 1 button for mana tempest, and 2 other button for emergency save. so total 3 button

i always want to hold right mouse, which keep my character always attack and moving at the same time. But when i do that, if i need to click other skill, so many times this other skill is cancel because the right mouse is always on hold and cancel other skill animation. i need to release the right mouse to click other skill. this slow down my gameplay and leave me in a danger situation

in other case, once i was surrounded by a lot of mob. i wanted to use "time freeze" skill then dodge roll, but i dodge roll too fast that "time freeze skill" was cancel, then i thought i already used time freeze, but not, then i die

i really hope there is a setting that set the skill is not canceled by other skill